Julie has two children. One of them is a boy What is the probability that both o
ID: 59241 • Letter: J
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Julie has two children. One of them is a boy What is the probability that both of her children are boys? Julie has one daughter and is now pregnant. What is the probability that Julie's next child will be a girl? Is there any difference between the problems in (a) and (b)? If so, what is it? In humans, the ability to taste the chemical phenylthiourea (PTU) is dominant. "Tasters" (TT) or (Tt) perceive an extremely bitter taste, while non-tasters (tt) cannot taste this substance at all. What phenotypes of offspring would be expected from the following crosses? In what ratios would you expect these offspring to occur? heterozygote X heterozygote heterozygote X non-taster homozygous taster X heterozygoteExplanation / Answer
12) A)
a) First two are boys - odds are 53.3% boy 46.7% will be the girl next time
b) 1/2 is the boy or girl so the chancess are 50-50
c) answer a - girl chance is less boy chancess are more
answer b - boy and girl chancess are same 50-50
13) A)
TT = homozygote (Taster)
Tt = heterozygote (Taster)
tt = homozygote ( non- taster)
a) heterozygote * heterozygote
Tt * Tt F1 generation
T , t * T t 4 gametes are formed
TT Tt , Tt tt fusen of 4 gametes leads the F2 genetation
TT - Taster = 1
Tt - Taster = 2
tt - non taster = 1 so phenotypic ratio is 3:1
b) heterozygote * non -taster (homozygote)
Tt * tt f1 generation
T, t * t t 4 gametes are formed fusen of this gametes leads to
Tt tt* Tt tt this if f2 generation
Tt - taster = 2
tt - nontaster =2 the phenotypic ratio is 2:2 or 1:1
c) homozygous taster * heterozygote
TT * Tt F1 generation
T,T,* T, t 4 gametes are formed
TT, Tt, Tt,TT, F2 generation
TT - taster =2
Tt - taster = 2 The phenotypic ratio 1 because all are tasters genotypic ratio is 2:2
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